hw/timer/allwinner-a10-pit.c - qemu - Git at Google

 /*
  * Allwinner A10 timer device emulation
  *
  * Copyright (C) 2013 Li Guang
  * Written by Li Guang <lig.fnst@cn.fujitsu.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
  * Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  * for more details.
  */

 #include "qemu/osdep.h"
 #include "hw/irq.h"
 #include "hw/qdev-properties.h"
 #include "hw/sysbus.h"
 #include "hw/timer/allwinner-a10-pit.h"
 #include "migration/vmstate.h"
 #include "qemu/log.h"
 #include "qemu/module.h"

 static void a10_pit_update_irq(AwA10PITState *s)
 {
     int i;

     for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
         qemu_set_irq(s->irq[i], !!(s->irq_status & s->irq_enable & (1 << i)));
     }
 }

 static uint64_t a10_pit_read(void *opaque, hwaddr offset, unsigned size)
 {
     AwA10PITState *s = AW_A10_PIT(opaque);
     uint8_t index;

     switch (offset) {
     case AW_A10_PIT_TIMER_IRQ_EN:
         return s->irq_enable;
     case AW_A10_PIT_TIMER_IRQ_ST:
         return s->irq_status;
     case AW_A10_PIT_TIMER_BASE ... AW_A10_PIT_TIMER_BASE_END:
         index = offset & 0xf0;
         index >>= 4;
         index -= 1;
         switch (offset & 0x0f) {
         case AW_A10_PIT_TIMER_CONTROL:
             return s->control[index];
         case AW_A10_PIT_TIMER_INTERVAL:
             return s->interval[index];
         case AW_A10_PIT_TIMER_COUNT:
             s->count[index] = ptimer_get_count(s->timer[index]);
             return s->count[index];
         default:
             qemu_log_mask(LOG_GUEST_ERROR,
                           "%s: Bad offset 0x%x\n",  __func__, (int)offset);
             break;
         }
     case AW_A10_PIT_WDOG_CONTROL:
         break;
     case AW_A10_PIT_WDOG_MODE:
         break;
     case AW_A10_PIT_COUNT_LO:
         return s->count_lo;
     case AW_A10_PIT_COUNT_HI:
         return s->count_hi;
     case AW_A10_PIT_COUNT_CTL:
         return s->count_ctl;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Bad offset 0x%x\n",  __func__, (int)offset);
         break;
     }

     return 0;
 }

 /* Must be called inside a ptimer transaction block for s->timer[index] */
 static void a10_pit_set_freq(AwA10PITState *s, int index)
 {
     uint32_t prescaler, source, source_freq;

     prescaler = 1 << extract32(s->control[index], 4, 3);
     source = extract32(s->control[index], 2, 2);
     source_freq = s->clk_freq[source];

     if (source_freq) {
         ptimer_set_freq(s->timer[index], source_freq / prescaler);
     } else {
         qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid clock source %u\n",
                       __func__, source);
     }
 }

 static void a10_pit_write(void *opaque, hwaddr offset, uint64_t value,
                             unsigned size)
 {
      AwA10PITState *s = AW_A10_PIT(opaque);
      uint8_t index;

     switch (offset) {
     case AW_A10_PIT_TIMER_IRQ_EN:
         s->irq_enable = value;
         a10_pit_update_irq(s);
         break;
     case AW_A10_PIT_TIMER_IRQ_ST:
         s->irq_status &= ~value;
         a10_pit_update_irq(s);
         break;
     case AW_A10_PIT_TIMER_BASE ... AW_A10_PIT_TIMER_BASE_END:
         index = offset & 0xf0;
         index >>= 4;
         index -= 1;
         switch (offset & 0x0f) {
         case AW_A10_PIT_TIMER_CONTROL:
             s->control[index] = value;
             ptimer_transaction_begin(s->timer[index]);
             a10_pit_set_freq(s, index);
             if (s->control[index] & AW_A10_PIT_TIMER_RELOAD) {
                 ptimer_set_count(s->timer[index], s->interval[index]);
             }
             if (s->control[index] & AW_A10_PIT_TIMER_EN) {
                 int oneshot = 0;
                 if (s->control[index] & AW_A10_PIT_TIMER_MODE) {
                     oneshot = 1;
                 }
                 ptimer_run(s->timer[index], oneshot);
             } else {
                 ptimer_stop(s->timer[index]);
             }
             ptimer_transaction_commit(s->timer[index]);
             break;
         case AW_A10_PIT_TIMER_INTERVAL:
             s->interval[index] = value;
             ptimer_transaction_begin(s->timer[index]);
             ptimer_set_limit(s->timer[index], s->interval[index], 1);
             ptimer_transaction_commit(s->timer[index]);
             break;
         case AW_A10_PIT_TIMER_COUNT:
             s->count[index] = value;
             break;
         default:
             qemu_log_mask(LOG_GUEST_ERROR,
                           "%s: Bad offset 0x%x\n",  __func__, (int)offset);
         }
         break;
     case AW_A10_PIT_WDOG_CONTROL:
         s->watch_dog_control = value;
         break;
     case AW_A10_PIT_WDOG_MODE:
         s->watch_dog_mode = value;
         break;
     case AW_A10_PIT_COUNT_LO:
         s->count_lo = value;
         break;
     case AW_A10_PIT_COUNT_HI:
         s->count_hi = value;
         break;
     case AW_A10_PIT_COUNT_CTL:
         s->count_ctl = value;
         if (s->count_ctl & AW_A10_PIT_COUNT_RL_EN) {
             uint64_t  tmp_count = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);

             s->count_lo = tmp_count;
             s->count_hi = tmp_count >> 32;
             s->count_ctl &= ~AW_A10_PIT_COUNT_RL_EN;
         }
         if (s->count_ctl & AW_A10_PIT_COUNT_CLR_EN) {
             s->count_lo = 0;
             s->count_hi = 0;
             s->count_ctl &= ~AW_A10_PIT_COUNT_CLR_EN;
         }
         break;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: Bad offset 0x%x\n",  __func__, (int)offset);
         break;
     }
 }

 static const MemoryRegionOps a10_pit_ops = {
     .read = a10_pit_read,
     .write = a10_pit_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
 };

 static Property a10_pit_properties[] = {
     DEFINE_PROP_UINT32("clk0-freq", AwA10PITState, clk_freq[0], 0),
     DEFINE_PROP_UINT32("clk1-freq", AwA10PITState, clk_freq[1], 0),
     DEFINE_PROP_UINT32("clk2-freq", AwA10PITState, clk_freq[2], 0),
     DEFINE_PROP_UINT32("clk3-freq", AwA10PITState, clk_freq[3], 0),
     DEFINE_PROP_END_OF_LIST(),
 };

 static const VMStateDescription vmstate_a10_pit = {
     .name = "a10.pit",
     .version_id = 1,
     .minimum_version_id = 1,
     .fields = (const VMStateField[]) {
         VMSTATE_UINT32(irq_enable, AwA10PITState),
         VMSTATE_UINT32(irq_status, AwA10PITState),
         VMSTATE_UINT32_ARRAY(control, AwA10PITState, AW_A10_PIT_TIMER_NR),
         VMSTATE_UINT32_ARRAY(interval, AwA10PITState, AW_A10_PIT_TIMER_NR),
         VMSTATE_UINT32_ARRAY(count, AwA10PITState, AW_A10_PIT_TIMER_NR),
         VMSTATE_UINT32(watch_dog_mode, AwA10PITState),
         VMSTATE_UINT32(watch_dog_control, AwA10PITState),
         VMSTATE_UINT32(count_lo, AwA10PITState),
         VMSTATE_UINT32(count_hi, AwA10PITState),
         VMSTATE_UINT32(count_ctl, AwA10PITState),
         VMSTATE_PTIMER_ARRAY(timer, AwA10PITState, AW_A10_PIT_TIMER_NR),
         VMSTATE_END_OF_LIST()
     }
 };

 static void a10_pit_reset(DeviceState *dev)
 {
     AwA10PITState *s = AW_A10_PIT(dev);
     uint8_t i;

     s->irq_enable = 0;
     s->irq_status = 0;
     a10_pit_update_irq(s);

     for (i = 0; i < 6; i++) {
         s->control[i] = AW_A10_PIT_DEFAULT_CLOCK;
         s->interval[i] = 0;
         s->count[i] = 0;
         ptimer_transaction_begin(s->timer[i]);
         ptimer_stop(s->timer[i]);
         a10_pit_set_freq(s, i);
         ptimer_transaction_commit(s->timer[i]);
     }
     s->watch_dog_mode = 0;
     s->watch_dog_control = 0;
     s->count_lo = 0;
     s->count_hi = 0;
     s->count_ctl = 0;
 }

 static void a10_pit_timer_cb(void *opaque)
 {
     AwA10TimerContext *tc = opaque;
     AwA10PITState *s = tc->container;
     uint8_t i = tc->index;

     if (s->control[i] & AW_A10_PIT_TIMER_EN) {
         s->irq_status |= 1 << i;
         if (s->control[i] & AW_A10_PIT_TIMER_MODE) {
             ptimer_stop(s->timer[i]);
             s->control[i] &= ~AW_A10_PIT_TIMER_EN;
         }
         a10_pit_update_irq(s);
     }
 }

 static void a10_pit_init(Object *obj)
 {
     AwA10PITState *s = AW_A10_PIT(obj);
     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
     uint8_t i;

     for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
         sysbus_init_irq(sbd, &s->irq[i]);
     }
     memory_region_init_io(&s->iomem, OBJECT(s), &a10_pit_ops, s,
                           TYPE_AW_A10_PIT, 0x400);
     sysbus_init_mmio(sbd, &s->iomem);

     for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
         AwA10TimerContext *tc = &s->timer_context[i];

         tc->container = s;
         tc->index = i;
         s->timer[i] = ptimer_init(a10_pit_timer_cb, tc, PTIMER_POLICY_LEGACY);
     }
 }

 static void a10_pit_finalize(Object *obj)
 {
     AwA10PITState *s = AW_A10_PIT(obj);
     int i;

     for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
         ptimer_free(s->timer[i]);
     }
 }

 static void a10_pit_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);

     device_class_set_legacy_reset(dc, a10_pit_reset);
     device_class_set_props(dc, a10_pit_properties);
     dc->desc = "allwinner a10 timer";
     dc->vmsd = &vmstate_a10_pit;
 }

 static const TypeInfo a10_pit_info = {
     .name = TYPE_AW_A10_PIT,
     .parent = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(AwA10PITState),
     .instance_init = a10_pit_init,
     .instance_finalize = a10_pit_finalize,
     .class_init = a10_pit_class_init,
 };

 static void a10_register_types(void)
 {
     type_register_static(&a10_pit_info);
 }

 type_init(a10_register_types);
	/*
	* Allwinner A10 timer device emulation
	*
	* Copyright (C) 2013 Li Guang
	* Written by Li Guang <lig.fnst@cn.fujitsu.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the
	* Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* for more details.
	*/

	#include "qemu/osdep.h"
	#include "hw/irq.h"
	#include "hw/qdev-properties.h"
	#include "hw/sysbus.h"
	#include "hw/timer/allwinner-a10-pit.h"
	#include "migration/vmstate.h"
	#include "qemu/log.h"
	#include "qemu/module.h"

	static void a10_pit_update_irq(AwA10PITState *s)
	{
	int i;

	for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
	qemu_set_irq(s->irq[i], !!(s->irq_status & s->irq_enable & (1 << i)));
	}
	}

	static uint64_t a10_pit_read(void *opaque, hwaddr offset, unsigned size)
	{
	AwA10PITState *s = AW_A10_PIT(opaque);
	uint8_t index;

	switch (offset) {
	case AW_A10_PIT_TIMER_IRQ_EN:
	return s->irq_enable;
	case AW_A10_PIT_TIMER_IRQ_ST:
	return s->irq_status;
	case AW_A10_PIT_TIMER_BASE ... AW_A10_PIT_TIMER_BASE_END:
	index = offset & 0xf0;
	index >>= 4;
	index -= 1;
	switch (offset & 0x0f) {
	case AW_A10_PIT_TIMER_CONTROL:
	return s->control[index];
	case AW_A10_PIT_TIMER_INTERVAL:
	return s->interval[index];
	case AW_A10_PIT_TIMER_COUNT:
	s->count[index] = ptimer_get_count(s->timer[index]);
	return s->count[index];
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"%s: Bad offset 0x%x\n", __func__, (int)offset);
	break;
	}
	case AW_A10_PIT_WDOG_CONTROL:
	break;
	case AW_A10_PIT_WDOG_MODE:
	break;
	case AW_A10_PIT_COUNT_LO:
	return s->count_lo;
	case AW_A10_PIT_COUNT_HI:
	return s->count_hi;
	case AW_A10_PIT_COUNT_CTL:
	return s->count_ctl;
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"%s: Bad offset 0x%x\n", __func__, (int)offset);
	break;
	}

	return 0;
	}

	/* Must be called inside a ptimer transaction block for s->timer[index] */
	static void a10_pit_set_freq(AwA10PITState *s, int index)
	{
	uint32_t prescaler, source, source_freq;

	prescaler = 1 << extract32(s->control[index], 4, 3);
	source = extract32(s->control[index], 2, 2);
	source_freq = s->clk_freq[source];

	if (source_freq) {
	ptimer_set_freq(s->timer[index], source_freq / prescaler);
	} else {
	qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid clock source %u\n",
	__func__, source);
	}
	}

	static void a10_pit_write(void *opaque, hwaddr offset, uint64_t value,
	unsigned size)
	{
	AwA10PITState *s = AW_A10_PIT(opaque);
	uint8_t index;

	switch (offset) {
	case AW_A10_PIT_TIMER_IRQ_EN:
	s->irq_enable = value;
	a10_pit_update_irq(s);
	break;
	case AW_A10_PIT_TIMER_IRQ_ST:
	s->irq_status &= ~value;
	a10_pit_update_irq(s);
	break;
	case AW_A10_PIT_TIMER_BASE ... AW_A10_PIT_TIMER_BASE_END:
	index = offset & 0xf0;
	index >>= 4;
	index -= 1;
	switch (offset & 0x0f) {
	case AW_A10_PIT_TIMER_CONTROL:
	s->control[index] = value;
	ptimer_transaction_begin(s->timer[index]);
	a10_pit_set_freq(s, index);
	if (s->control[index] & AW_A10_PIT_TIMER_RELOAD) {
	ptimer_set_count(s->timer[index], s->interval[index]);
	}
	if (s->control[index] & AW_A10_PIT_TIMER_EN) {
	int oneshot = 0;
	if (s->control[index] & AW_A10_PIT_TIMER_MODE) {
	oneshot = 1;
	}
	ptimer_run(s->timer[index], oneshot);
	} else {
	ptimer_stop(s->timer[index]);
	}
	ptimer_transaction_commit(s->timer[index]);
	break;
	case AW_A10_PIT_TIMER_INTERVAL:
	s->interval[index] = value;
	ptimer_transaction_begin(s->timer[index]);
	ptimer_set_limit(s->timer[index], s->interval[index], 1);
	ptimer_transaction_commit(s->timer[index]);
	break;
	case AW_A10_PIT_TIMER_COUNT:
	s->count[index] = value;
	break;
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"%s: Bad offset 0x%x\n", __func__, (int)offset);
	}
	break;
	case AW_A10_PIT_WDOG_CONTROL:
	s->watch_dog_control = value;
	break;
	case AW_A10_PIT_WDOG_MODE:
	s->watch_dog_mode = value;
	break;
	case AW_A10_PIT_COUNT_LO:
	s->count_lo = value;
	break;
	case AW_A10_PIT_COUNT_HI:
	s->count_hi = value;
	break;
	case AW_A10_PIT_COUNT_CTL:
	s->count_ctl = value;
	if (s->count_ctl & AW_A10_PIT_COUNT_RL_EN) {
	uint64_t tmp_count = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);

	s->count_lo = tmp_count;
	s->count_hi = tmp_count >> 32;
	s->count_ctl &= ~AW_A10_PIT_COUNT_RL_EN;
	}
	if (s->count_ctl & AW_A10_PIT_COUNT_CLR_EN) {
	s->count_lo = 0;
	s->count_hi = 0;
	s->count_ctl &= ~AW_A10_PIT_COUNT_CLR_EN;
	}
	break;
	default:
	qemu_log_mask(LOG_GUEST_ERROR,
	"%s: Bad offset 0x%x\n", __func__, (int)offset);
	break;
	}
	}

	static const MemoryRegionOps a10_pit_ops = {
	.read = a10_pit_read,
	.write = a10_pit_write,
	.endianness = DEVICE_NATIVE_ENDIAN,
	};

	static Property a10_pit_properties[] = {
	DEFINE_PROP_UINT32("clk0-freq", AwA10PITState, clk_freq[0], 0),
	DEFINE_PROP_UINT32("clk1-freq", AwA10PITState, clk_freq[1], 0),
	DEFINE_PROP_UINT32("clk2-freq", AwA10PITState, clk_freq[2], 0),
	DEFINE_PROP_UINT32("clk3-freq", AwA10PITState, clk_freq[3], 0),
	DEFINE_PROP_END_OF_LIST(),
	};

	static const VMStateDescription vmstate_a10_pit = {
	.name = "a10.pit",
	.version_id = 1,
	.minimum_version_id = 1,
	.fields = (const VMStateField[]) {
	VMSTATE_UINT32(irq_enable, AwA10PITState),
	VMSTATE_UINT32(irq_status, AwA10PITState),
	VMSTATE_UINT32_ARRAY(control, AwA10PITState, AW_A10_PIT_TIMER_NR),
	VMSTATE_UINT32_ARRAY(interval, AwA10PITState, AW_A10_PIT_TIMER_NR),
	VMSTATE_UINT32_ARRAY(count, AwA10PITState, AW_A10_PIT_TIMER_NR),
	VMSTATE_UINT32(watch_dog_mode, AwA10PITState),
	VMSTATE_UINT32(watch_dog_control, AwA10PITState),
	VMSTATE_UINT32(count_lo, AwA10PITState),
	VMSTATE_UINT32(count_hi, AwA10PITState),
	VMSTATE_UINT32(count_ctl, AwA10PITState),
	VMSTATE_PTIMER_ARRAY(timer, AwA10PITState, AW_A10_PIT_TIMER_NR),
	VMSTATE_END_OF_LIST()
	}
	};

	static void a10_pit_reset(DeviceState *dev)
	{
	AwA10PITState *s = AW_A10_PIT(dev);
	uint8_t i;

	s->irq_enable = 0;
	s->irq_status = 0;
	a10_pit_update_irq(s);

	for (i = 0; i < 6; i++) {
	s->control[i] = AW_A10_PIT_DEFAULT_CLOCK;
	s->interval[i] = 0;
	s->count[i] = 0;
	ptimer_transaction_begin(s->timer[i]);
	ptimer_stop(s->timer[i]);
	a10_pit_set_freq(s, i);
	ptimer_transaction_commit(s->timer[i]);
	}
	s->watch_dog_mode = 0;
	s->watch_dog_control = 0;
	s->count_lo = 0;
	s->count_hi = 0;
	s->count_ctl = 0;
	}

	static void a10_pit_timer_cb(void *opaque)
	{
	AwA10TimerContext *tc = opaque;
	AwA10PITState *s = tc->container;
	uint8_t i = tc->index;

	if (s->control[i] & AW_A10_PIT_TIMER_EN) {
	s->irq_status \|= 1 << i;
	if (s->control[i] & AW_A10_PIT_TIMER_MODE) {
	ptimer_stop(s->timer[i]);
	s->control[i] &= ~AW_A10_PIT_TIMER_EN;
	}
	a10_pit_update_irq(s);
	}
	}

	static void a10_pit_init(Object *obj)
	{
	AwA10PITState *s = AW_A10_PIT(obj);
	SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
	uint8_t i;

	for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
	sysbus_init_irq(sbd, &s->irq[i]);
	}
	memory_region_init_io(&s->iomem, OBJECT(s), &a10_pit_ops, s,
	TYPE_AW_A10_PIT, 0x400);
	sysbus_init_mmio(sbd, &s->iomem);

	for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
	AwA10TimerContext *tc = &s->timer_context[i];

	tc->container = s;
	tc->index = i;
	s->timer[i] = ptimer_init(a10_pit_timer_cb, tc, PTIMER_POLICY_LEGACY);
	}
	}

	static void a10_pit_finalize(Object *obj)
	{
	AwA10PITState *s = AW_A10_PIT(obj);
	int i;

	for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
	ptimer_free(s->timer[i]);
	}
	}

	static void a10_pit_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);

	device_class_set_legacy_reset(dc, a10_pit_reset);
	device_class_set_props(dc, a10_pit_properties);
	dc->desc = "allwinner a10 timer";
	dc->vmsd = &vmstate_a10_pit;
	}

	static const TypeInfo a10_pit_info = {
	.name = TYPE_AW_A10_PIT,
	.parent = TYPE_SYS_BUS_DEVICE,
	.instance_size = sizeof(AwA10PITState),
	.instance_init = a10_pit_init,
	.instance_finalize = a10_pit_finalize,
	.class_init = a10_pit_class_init,
	};

	static void a10_register_types(void)
	{
	type_register_static(&a10_pit_info);
	}

	type_init(a10_register_types);